By George P. Hassett

Mayor Joseph A. Curtatone is “taking a harder look at the contract” of a sewer and water company that has been working with the city for more than 70 years, according to a city spokeswoman.

Lesley Delaney Hawkins said PT Kelly was the only bidder to handle Somerville’s water and sewer work but Curtatone has not yet agreed to hire them for another year.

‚ÄúIt is the mayor’s responsibility to protect the investment of the taxpayers and he is taking a harder look at the contract before he signs anything. He is not to a point where he has made a decision yet,‚Äù she said.

PT Kelly did not return repeated phone calls.